id	author	title	date	pages	extension	mime	words	sentence	flesch	summary	cache	txt
app01-7030	Barták, Jiří	THE OLDEST UNDERGROUND RAILWAYS IN THE WORLD AND THEIR ANNIVERSARIES	2021	5	.pdf	application/pdf	3321	171	62	Original Athens metro line after doubling of the track [4] Currently Athens Metro (Aττικó Mετρó ) has 3 lines (see Fig. 4) with an aggregate length of 84.5km. Numerous fundamental things required for the commencement of operations in the underground (steam locomotives with the necessary power, rail- bound passenger cars, rolled rails and their fixing, design of trackwork and other technical equipment) were tried on railway tracks.	cache/app01-7030.pdf	txt/app01-7030.txt